I looked really hard at the AimTech -- I like the idea of a "see through" scope mount that also has some ability to keep the barrel cool. But, IMHO, it just looks goofy on top of a rifle. It's just too tall.
That's why I went with a home-modified Ranch Products mount...
Choosing between the three in the OP, I'd go with the UltiMAK. Low profile, (miniscule) cooling vents. It doesn't look out of place, IMO.